Steam boiler and superheater



Oct. 13, 1931. LANGVAND 1,827,529

STEAM BOILER AND SUPERHEATER Filed April 10. 1928 2 Sheets-Sheet 1 Fig- .25

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Oct. 13, 1931. LANGVAND I 1,827,529

STEAM BOILER AND SUPERHEAT ER Filed April 10, 1928 2 Sheets-Sheet 2 1|]: iiii llllhurlllll' II 1 Ml ll. flhlll] I INVENTOR Patented Oct. 13, 19 31 UNITED STATES fiElSSUt-Itl PATENT OFFICE IVAR L. LANGVAND, F BARBERTON, OHIO, ASSIGNOR TO THE BABCOGK & WILCOX COMPANY, OF BAYONNE, NEW JERSEY, A CORPORATION OF NEW JERSEY STEAM BOILER AND SUPERHEATER Application filed April 10,

This invention relates to a steam boiler of the Stirling type in which a superheater is located in such a position that it is readily accessible without removing the boiler parts. The invention will be understood from the description in connection with the accompanying drawings in which Fig. 1 is a vertical section through an illustrative embodiment of the invention; Fig. 2 is a vertical section along the line 22 of Fig. 1 or Fig. 3; Fig. 3 is a side view of Fig. 2; Fig. 4 is a section on an enlarged scale along the line 4.4 of Fig. 3 or along the line 44 of Fig. 5; Fig. 5 isa side view of Fig. 4 and Fig. 6 is a plan view of the device.

In the drawings reference characters 1, 2 and 3 indicate the upper drums of the boiler of which the lower or mud drum is shown at 4. A bank of tubes 5, only one row of which is shown on the drawings, connects the drum 1 to the drum 4, and a bank of 'tubes 6 connects the drum 2 to the drum 4.

A baflie 7 is located between the banks of tubes 5 and 6 and extends upwardly from the drum 4 to .a short distance below the drums 1 and 2. The bafile 8 extends behind the first row of tubes in the bank 6 from the drum 2 downwardly to within a short distance of the drum 4. A bank of circulating tubes 9 extends from the drum 1 to the drum 2 and a row of tubes 10 also connects the steam spaces of these drums. A row of tubes 11 connects the steam spaces of the drums 2 and 3. A roof 12 is located between the drums 1 and 2 and the drums 2 and 3. An I-beam 13 may be provided to support the roof 12 between the drums 2 and 3 by means of the supports 14.

A row of tubes 15 extends from the water space of the drum 3 along the front wall of the boiler to a header 16 from which header tubes 17 may extend to a header at the lower portion of the furnace wall (not shown) of the furnace 18. I-beams 19 are provided to support the boiler parts from below.

Two rows of tubes 20 extend downwardly at an angle from the water space of the drum 3 and are bent so as to enter the header 16 in two rows. The tubes in each row 20 are of slightly difi'erent lengths and the lower 1928. Serial No. 268,823.

portions are separated from each other, as indicated at 20, to leave spaces so that gases can readily pass therethrough from the furnace 18 as the gases rise between the front wall 21 of the furnace and the baflie 22 on the other side. Two rows of tubes 23 extend from a furnace wall header (not shown) parallel to a portion of the tubes 20 and enter the water space of the drum 3.

' A plurality of steam pipes 25 extends from the steam space of the drum 1 to a superheater header 26 located at the roof 12. The pipes 25 enter the superheater header at points substantially uniformly .distributed along the header.

Two rows of tubes 27 and 27 extend from the superheater header 26 downwardly in the space between the tubes 23 and the bank of tubes 6 and enter a lower superheater header 28. The superheater header 28 may be located at a lower level than the drum 4 and rows of return tubes 29 of the superheater extend from the header 28 between the tubes 23 and banks of tubes 6 to the outlet header 30 of the superheater also located at the roof 12.

I The upper ends of the tubes 27 and 27 extend from separate rows of holes in the header 26 and the upper portions of these tubes are separated from each other sufficient distances to permit a gas passage between them. The tubes 27 are bent some distance below their upper ends so as to contact with the tubes 27, as most clearly shown in Figs. 2 and 4 and provide a ballie for the gases from the furnace. The tubes 20, 23 and 27 may be spaced from each other and held in position by means of clips 31, and clips 32 connect the tubes 29 to each other and to the first row of the bank of tubes 6 in a similar manner. Bridge pieces 33 provided with wedge shaped openings contact with pairs of tubes 27, and wedge shaped pins 34 extend through the holes in these bridge members and are welded, or otherwise attached, to tubes 27 so as to keep the tubes 27 and 27 in contact with each other. The contacting portions of the tubes 27 and 27 form a solid wall across the boiler. The tubes 20 and 23 have wide gas lanes between them so that the front face of the tubes 27 and 27 that come opposite these gas lanes are exposed to the radiant heat of the boiler furnace.

A closure 35 may extend from the bafile 22 to and around the boiler side of the header 28, thence to the drum 4 and an opening 36 may be provided in thisclosure 35 for the removal of soot and dust that may be collected in the space.

By this invention the superheater for a boiler of the Stirling type is located behind steam generating tubes so as to be shielded to a large extent from the radiant heat of the furnace, and at the same time become contacted byhot gases that have not geen greatly reduced in temperature by passing over a large bank of water tubes. At the same time both the headers and the tubesof the superheater are located in such positions that they can be reached forinspection, cleaning or re-' pair without removing the bo1ler parts. The

plurality of, inlets from the steam space of the boiler to the superheater header provides even distribution of the, steam through the superheater tubes from one end of the header to the other. The gases from the'furnace 18 first cross the portions 20' of the tubes and pass upwardly over the upper edge of the baflie formed by the tubes 27 and 27' through the spaces between the upper ends of the tubes 27 and 27 thence downwardly and under the lower edge of the baflle 8, thence upwardly around the upper end of the baflie 7 and thence across the bank of tubes 5 to the outlet or stack.

I claim: 1. In a boiler of the Stirling type, upper and lower drums, banks of tubes connecting said drums, a superheater-behind the first bank of boiler tubes, and means to cause gases from the furnace of said boiler to cross some of the tubes of said first bank twice before crossing said superheater tubes.

. 2. In a boiler ofthe Stirling type, upper and lower drums, banks of tubes connecting said drums, a superheater behind the first bank of boiler tubes, andmeans to cause gases I from the furnace of said boiler to cross some of the tubes of said first bank twice before crossing said superheater tubes, tubes of said superheater constituting a gas baflle.

, 3. In a steam boiler and its furnace, a superheater inlet header, an outlet header for thesuperheater, an intermediate superheater header, a first bank of superheater tubes extending in substantially parallel relation shi s for the greater parts' of their lengths and connecting saidmletheader with the intermediate header, a second bank of superheater tubes substantiall *parallel throughout the greater parts 0 their lengths and connecting the intermediate header with the tl t header, means supporting said intermediate header at a position laterally removed withrespect tojprojections of the parallel portions of said superheater tubes, a. plurality of tubes communicating with the steam spaces of the boiler and the inlet heater tubes substantially parallel throughout the greater parts of the ir lengths and connecting the intermediate header with the outlet header, a plurality of tubes communicating with the steam spaces of the boiler and the inlet header of the superheater at a plurality of positions distributed along said inlet header, and boiler tubes located between said banks of superheater tubes of the fur nace, said-first'bank.of superheater tubes being located nearer the furnace than the second bank, said first bank of tubes also being arranged in part to form a bafiie for causing the gases to flow parallel thereto andafterwardsto cross said'first bank and flow over the second bank.

5. In a steam boiler and its furnace, a superheater inlet header, an outlet header for the superheater, an intermediate superheater header, a first bank of superheater tubes ex-.

tending in substantially parallel relationships for the greater parts of their lengths and connecting said inlet header with the intermediate header, a second bank of superheater tubes substantially parallel throughout the greater parts of their lengths and connecting the intermediate header with the outlet header, means supporting said intermediate header at a position laterally removed with respect to projections of the parallel portions of said superheater tubes, the superheater tubes being bent at their lower ends in order that they may enter the intermediate header, a plurality of tubes communicating with the steam spaces of the boiler and the inlet header of the superheater at a lurality of positions distributed alongsaid inlet header, and boiler tubes located between said banks of superheater tubes of the furnace, said first bank of superheater tubes being located nearer the furnace than the second bank, said first bank of tubes also being arranged in part-to form a baflie for causln the gases to flow parallel thereto and a t'erwards to cross said first bank and flow over'the second bank.

6, In a steam boiler and its furnace, a boiler setting, a plurality of'steam and water drums at the top of the setting, a mud drum, a bank of steam generatin tubes connecting the mud drum with one o the upper drums, a boiler header remote from the mud drum and adjacent one side of the first gas pass at its lower end, a superheater inlet header near the top of the boiler, superheater tubes extending in two rows from the said inlet header with the tubes in different rows in staggered relationship and in tube to tube contact so as to constitute a substantially imperforate heat absorbing wall forming a baflie defining one side of the first gas pass, a bank of steam generating tubes extending from said boiler header toward and transversely of said battle with bends near the baffie so that the remaining portions of the tubes of said bank extend along said battle to positions wherein they directly communicate with one of the upper steam and water drums, tubes extending from said last mentioned drum along and directly in front of said baffle and beyond the same to an additional header, the baffle wall secured in place on said last mentioned tubes, and constituting a downward continuation of the first battle, and a wall extending downwardly near said last mentioned steam and water drum to form the other wall of said first gas pass, the arrangement being such that the baflie formed by the superheater tubes compels all of the gases of the first gas pass 'to pass completely across and along one bank of steam generating tubes.

7. In a steam boiler and its furnace, steam and water drums, water drums below said first mentioned drums, banks of steam generating tubes connecting said up er and lower drums, and superheater tubes etween two of said banks of tubes and arranged in two rows with the tubes of the rows in staggered relationship and in tube to tube contact so as to constitute a substantially imperforate heat absorbing wall forming a bafiie compelling all of the gases in one gas pass to proceed completely across and along one bank of steam generating tubes.

IVAR L. LANGVAND. 

